Registration Dossier
Registration Dossier
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EC number: 257-407-3 | CAS number: 51772-85-1
Endpoint summary
Administrative data
Description of key information
Additional information
The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2), see table below. Due to the very rapid hydrolysis of the parent substance, the distribution calculation is done for the silanol hydrolysis product.
Table: Distribution modelling for STP
Fraction of emission directed to air by STP |
2.4E-09 |
[%] |
Fraction of emission directed to water by STP |
100 |
[%] |
Fraction of emission directed to sludge by STP |
0.045 |
[%] |
Fraction of the emission degraded in STP |
0 |
[%] |
3-[Tris(acetoxy)silyl]propyl methacrylate hydrolyses very rapidly to 3-(trihydroxysilyl)propyl methacrylate. 3-[Tris(acetoxy)silyl]propyl methacrylate is expected to be readily biodegradable but failing the 10-day window, based on read-across from a structurally-related substance. Once the biodegradation of the alkoxy groups is taken into account there is evidence that the methacrylate side-chain is biodegrading to some extent, based on data available for the analogue group of organosilicon substances containing acrylate functionality in the hydrocarbon chain attached to Si.
3-(Trihydroxysilyl)propyl methacrylate is predicted to have very low Henry’s Law Constant, low log Kow/log Koc. There is evidence that the methacrylate side-chain is biodegrading to some extent, but as a worst case 3-(trihydroxysilyl)propyl methacrylate is considered to be not biodegradable. In a sewage treatment plant, water is the main compartment to which 3-(trihydroxysilyl)propyl methacrylate is expected to partition.
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